Enable ARC for //ios/web_view/internal/translate/*.m.

ios/web_view/internal/translate/web_view_translate_client.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web_view/internal/translate/web_view_translate_client.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/memory/ptr_util.h"
 #include "components/infobars/core/infobar.h"
 #include "components/prefs/pref_service.h"
 #include "components/translate/core/browser/page_translated_details.h"
 #include "components/translate/core/browser/translate_accept_languages.h"
 #include "components/translate/core/browser/translate_infobar_delegate.h"
 #include "components/translate/core/browser/translate_manager.h"
 #include "components/translate/core/browser/translate_prefs.h"
 #include "components/translate/core/browser/translate_step.h"
 #include "ios/web/public/browser_state.h"
 #import "ios/web/public/web_state/web_state.h"
 #include "ios/web_view/internal/pref_names.h"
 #import "ios/web_view/internal/translate/cwv_translate_manager_impl.h"
 #include "ios/web_view/internal/translate/web_view_translate_accept_languages_factory.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 #import "ios/web_view/public/cwv_translate_delegate.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 DEFINE_WEB_STATE_USER_DATA_KEY(ios_web_view::WebViewTranslateClient);
 
 namespace ios_web_view {
 
 WebViewTranslateClient::WebViewTranslateClient(web::WebState* web_state)
     : web::WebStateObserver(web_state),
       translate_manager_(base::MakeUnique<translate::TranslateManager>(
           this,
           prefs::kAcceptLanguages)),
       translate_driver_(web_state,
                         web_state->GetNavigationManager(),
                         translate_manager_.get()) {}
 
 WebViewTranslateClient::~WebViewTranslateClient() = default;
 
 // TranslateClient implementation:
 
 std::unique_ptr<infobars::InfoBar> WebViewTranslateClient::CreateInfoBar(
     std::unique_ptr<translate::TranslateInfoBarDelegate> delegate) const {
   NOTREACHED();
   return nullptr;
 }
 
 void WebViewTranslateClient::ShowTranslateUI(
     translate::TranslateStep step,
     const std::string& source_language,
     const std::string& target_language,
     translate::TranslateErrors::Type error_type,
     bool triggered_from_menu) {
-  if (!delegate_)
+  if (!delegate_.get())
     return;
 
   if (error_type != translate::TranslateErrors::NONE)
     step = translate::TRANSLATE_STEP_TRANSLATE_ERROR;
 
   translate_manager_->GetLanguageState().SetTranslateEnabled(true);
 
   if (step == translate::TRANSLATE_STEP_BEFORE_TRANSLATE &&
       !translate_manager_->GetLanguageState().HasLanguageChanged()) {
     return;
@@ skipping 69 matching lines @@
 }
 
 void WebViewTranslateClient::WebStateDestroyed() {
   // Translation process can be interrupted.
   // Destroying the TranslateManager now guarantees that it never has to deal
   // with nullptr WebState.
   translate_manager_.reset();
 }
 
 }  // namespace ios_web_view